[Bug fortran/105381] [12 Regression] Memory-hog since r12-8230

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105381

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Mikael Morin <mikael@gcc.gnu.org>:

https://gcc.gnu.org/g:3e0c9fdfd00b5b5cbff1a0bd6ac012a10fe81348

commit r12-8280-g3e0c9fdfd00b5b5cbff1a0bd6ac012a10fe81348
Author: Mikael Morin <mikael@gcc.gnu.org>
Date:   Wed Apr 27 11:36:00 2022 +0200

    fortran: Avoid infinite self-recursion [PR105381]

    Dummy array decls are local decls different from the argument decl
    accessible through GFC_DECL_SAVED_DESCRIPTOR.  If the argument decl has
    a DECL_LANG_SPECIFIC set, it is copied over to the local decl at the
    time the latter is created, so that the DECL_LANG_SPECIFIC object is
    shared between local dummy decl and argument decl, and thus the
    GFC_DECL_SAVED_DESCRIPTOR of the argument decl is the argument decl
    itself.

    The r12-8230-g7964ab6c364c410c34efe7ca2eba797d36525349 change introduced
    the non_negative_strides_array_p predicate which recurses through
    GFC_DECL_SAVED_DESCRIPTOR to avoid seeing dummy decls as purely local
    decls.  As the GFC_DECL_SAVED_DESCRIPTOR of the argument decl is itself,
    this can cause infinite recursion.

    This change adds a check to avoid infinite recursion.

            PR fortran/102043
            PR fortran/105381

    gcc/fortran/ChangeLog:

            * trans-array.cc (non_negative_strides_array_p): Inline variable
            orig_decl and merge nested if conditions.  Add condition to not
            recurse if the next argument is the same as the current.

    gcc/testsuite/ChangeLog:

            * gfortran.dg/character_array_dummy_1.f90: New test.